[Toponaming] create ElementMap class (#9175)

* Copypaste ElementMap
* Add MappedNameRef
* Fix missing include
* Copypaste `findTagInElementName`
* fix error introduced _somewhere_
* refactor toponaming constants
* Move `findTagInElementName` in `MappedName`
* reintroduce workaround to compile ElementMap
* Added missing functions copied from complexgeodata
* fix last compile errors, reorder and format files
* remove recursive refs to ComplexGeoData
* Add more comments
* fixed comments and added tests
* added FIXME, make functions private, misc fixes
* Move static functions from complexGeoData to PostfixStringReferences. Rename to ElementNamingUtils
* Fix broken includes due to previous change
* Revert constants from string to const char*
* added childmap tests and made hasher public
* Make functions private
* Added remaining tests
* removed bool return from `erase` functions
* fix missing appexport

Co-authored-by: John Dupuy <jdupuy98@gmail.com>

src/Gui/Document.cpp

@@ -36,11 +36,11 @@
 #endif
 
 #include <App/AutoTransaction.h>
-#include <App/ComplexGeoData.h>
 #include <App/Document.h>
 #include <App/DocumentObject.h>
 #include <App/DocumentObjectGroup.h>
 #include <App/Transactions.h>
+#include <App/ElementNamingUtils.h>
 #include <Base/Console.h>
 #include <Base/Exception.h>
 #include <Base/Matrix.h>
@@ -408,7 +408,7 @@ bool Document::setEdit(Gui::ViewProvider* p, int ModNum, const char *subname)
     d->_editSubname.clear();
 
     if (subname) {
-        const char *element = Data::ComplexGeoData::findElementName(subname);
+        const char *element = Data::findElementName(subname);
         if (element) {
             d->_editSubname = std::string(subname,element-subname);
             d->_editSubElement = element;